#include <stdio.h>
int main()
{
	double a,b;char c;
	scanf("%lf%c%lf",&a,&c,&b);
	switch(c)
	{
		case '+':printf("%.2lf",a+b);break;
		case '-':printf("%.2lf",a-b);break;
		case '*':printf("%.2lf",a*b);break;
		case '/':if(b==0)printf("Divisor can not be 0!");else printf("%.2lf",a/b);break;
		default :printf("Unknown operator!");break;
	}
    return 0;
}
